Holder for punches and the like.



3/91 144 as M! a T. H. LEWTHWAITE.

Patented July 19, 1910.

,5] wue m to z J/Eomasfllewfkwaiie 35 3A at'lfowa THOMAS H. Lnw'rnWAIrE,or NEW YQRK, N. Y.

HOLDER FOR PUNCHES AND THE LI KE.

Specification of Letters Patent. Patented 1y 19, 1910,

Application filed August 11, 1909. Serial No. 512,349.

To all whom it may concern:

Be it known that I, THOMAS H. LEWTH- WAITE, a citizen of the UnitedStates, residing in the borough of Brooklyn, county of Kings, city andState of New York, have invented certain new and useful Improvements inHolders for Punches and the Like, of which the following is aspecification.

This invention relates to punch-holders and the like, and the object ofthe invention is to provide a holder of this class to permit the use ofreversible punches, means being provided to enable the use of the iolderin punch presses having variable distances between the die and the punchslide.

A further object of the invention is to provide an abutment for thepunch and which will protect from injury the end of the punch extendinginto the holder, as Well as the holder.

In carrying out the invention I provide a clamping member comprising ashank and split nipple for the reception of the unch, said clampingmember being engage by a binding or looking member to lock the punch inplace, an abutment being provided for that end of the punch whichextends into the clamping member to receive the force of the punch blowand protect the end of the punch when the punch press is in operation,and also the seat in the holder.

In the accompanying drawings Figurel is a sectional side elevation of myimproved punch holder, showing the shank and nipple integral andprovided with an adjustable abutment for the punch. Fig. 2 is asectional side elevation showing the nipple separable from the shank andthe abutment as a hardened washer between the shank and nipple. Fig. 3is a view similar toFig. 1, but showing the nipple separable from theshank. Fig. 4 is a sectional side elevation showing the locking memberand nipple con tained within a' bore in the shank, the nipple beingseparable from the shank, and the abutment in the form of a hardenedwasher between the shank and nipple or collet. Fig. 5 is a perspectiveview 0 the nipple or collet- Figs. 6 and 7 are sectional side elevationsof the collet. Figs. 8 and 9 are plan views of the nipple or collet,showing the holes of difierent shapes for the reception of variablyformed punches. Fig. 10 is a perspective view of punches-of variousshapes; and Fig. 11 is a perspective view of the abutment washer shownin Fig. 4.

The shank of the holder 1 engages the usual recess in the plunger 2 ofthe punch press and retained thereinby any suitable means, as a screw 3.In Fig. lthe shank 1 is provided with an integral clamping portion ornipple 4: having milled cuts 5, preferably three in number. The nipplehas a bore 5 which is'engaged by and conforms to the shape of the punch7 and is provided with screw threads 8 engaged by an internallyscrew-threaded binding or locking member 9, said binding member being inthe present instance in the form of a nut and having a tapered portion10 to engage a tapered portion 11 on the nipple to press the sections ofthe nipple against the unch and firmly clamp it in place. Very o ten itis found desirable to use the holder in a punch press having a veryshort stroke or space between the die and plunger of the press, and forthis purpose I provide the shank 1 with a bore 12 into which the end 13of the punch may extend. Said bore is screw threaded and engaged by ascrew threaded adjustable abutment 14 for the punch, said abutment beingengaged by the end of the punch to receive the force of the punch blowwhen the press is in operation and protecting said end of the punch frominjury. The abutment has a screw-driver slot 15 to permit fineadjustment of the punch to compensate for wear or grinding of the punchwhen sharpened.

In Fig. 2 the nipple is shown in the form of a one piece collet 4? andseparable from the shank 1, and also being split 'for a por tion of itslength, as at 5*. Said collets may be of variable lengths (Figs. 2,3, 6and 7) to permit the use of the holder in punch presses having either ashort or long stroke: or space between the die and the press plunger;and also giving stability and rigidity to the unch when in use. In thisview the punch 1s shown as operating upon a piece of angle iron 21, toillustrate the purpose of the long collet. The shank 1 is screwthreaded,as at 8, and engaged by a binding or locking nut 9, the tapered portion10 of which nut engages the tapered portion 11 on the collet, not onlyto firmly clamp the punch 7 in place, but to also connect the collet tothe shank. A hardened metal 'washer 16 is interposed between the end ofit will be understood that theregmay b'e-a' the said bead being ofpunches 7 of variable shapes In Fig. 3 the shank and clamping member areseparable the same as in Fig. 2, but a screw threaded bore extendsthrough the shank into which the end of the punch may extend to beengaged by an adjustable abutment the same as in Fig. 1.

In Fig. 4 the clamping members are shown as contained within a bore 17in the shank 1 said bore being screw-threaded and engage by anexternally screw-threaded binding or looking nut 9 and having a taperedhole '10 to engage the taper 11 on the collet to clamp the punch inplace and connect the collet to the shank. A hardened washer 16 is alsointerposed between the collet 4 and the bottom of the screw threadedbore 17 in the shank 1 for the purpose hereinbeforc set forth. Saidwasher, however, is provided with recesses 18 to be engaged by a prickpoint 19, which it is sometimes desirable to have on the punches, toprotect them from injury.

In FigsQ8 and9 are shown nipples or collets having holes or bores 6" ofdifferent shapes. lVhile I have shown only two forms great number ofdifferent forms to receive said punches being made of standard stock,readily procurable on the market, and breaches may be made from saidstock and the holes in the collets broached out to shape.

Both 'ends of the screw threaded abutm'ent 14 may be provided withscrew-driver slots to permit ready adjustment of said abutment-from thelower end of the bore in the shank 1 (Fig. 1), and without the necessityof removing the holder from the punch press.

.The' punch 7 may be provided with a groove 20, and a corresponding heador projection provided in the collet 4 to fit in said groove toprevent-the punch from pulling t from the holder when it becomes dull,such proportion and provided in the split portion of the collet toreadily permit of the punch being sprung into place.

Variations may be resorted to within the scope of the invention, andport-ions ofthe invention maybe used without others.

WhatI claim is:

1. In a holder for reversible punches, the combination of a shankprovided-with a bore, a clamping member, a binding nut to engage saidclamping member and shank, and an abutment for the punch in the bore ofthe shank.

2. In a holder for reversible punches, the combination of a shankprovided with a (Fig. 10)

screw-threaded bore into which the punch extends, a split clampingmember, a bindin nut to en age said clampin member an shank, an ascrew-threade abutment for the punch, in the bore of the shank.

3. In'a holder for reversible punches, the combination of a shank h'avinexternal screw threads and provided wit a screw threaded bore, aone-piece split collet or clamping member havin an external taper, abinding nut provided with an internal taper to engage the shank andcollet to con nect the same, and a screw-threaded abutment in the shankto take up the force of the punch blow.

4. In a holder for reversible combination with a shank, of a splitnipple, a binding nut to enga e the shank and nipple to firmly clamp t epunch in lace, a bore in the shank, and an adjustab e abutment in thebore of the shank for the punch.

5. In a holder for reversible punches, the combination with a shankhaving external screw threads, of a tapered nipple split for a portionof its length, a binding nut having an'internal taper to engage theshank an nipple to firmly clamp the unch in place, a screw-threaded boreexten ing through the shank, and a screw-threaded abutment in the boreof the shank to take up the force of the punch blow and also permit fineadjustment of the punch.

6. A holder for reversible punches comprising a shank havin a bore, aone piece tapered nipple split for a portion of its length, a bindingnut provided with aninternal tapered portion to engage the shank andnipple, and an adjustable abutment for the punch in the bore of theshank.

7. In a holder for reversible punches, the combination of a shank havingan externally screw threaded end, a screw threaded bore extendingthrough said shank into which the punch extends, a tapered one piececollet punches, the

or clamping member split for a portion of its length, a nut to engagethe shank and having an internal taper to engage the taper on the colletto connect the collet to the shank, and to press the split portions ofthe collet againstthe punch and firmly hold the latter in place, and ascrew threaded abutment for the punch in the bore of the shank to permitfine adjustment of the punch and to also take up the force of the punchblow; said clamping member or collet bein of considerable length torigidly hold the punch.

THOMAS H. LEWTHWAITE. Witnesses:

B. B. ZIP ERT, OT'ro GREENBERGER.

